Multiple Response Variables

Coding the responses to multiple response variables is necessary when more than one response is possible from a given question. For example, as part of a larger market survey, suppose you asked a sample of consumers to name their three favorite soft drinks. The specific item on the questionnaire may look like this:

Write down your three favorite soft drinks:

1:________ 2:________ 3:________

Thus, the questionnaires returned to you will contain somewhere between 0 and 3 answers to this item. Also, a wide variety of soft drinks will most likely be named. One way to record the various responses would be to use three multiple response variables and a coding scheme for the many soft drinks. Then we could enter the respective codes (or alphanumeric labels) into the three variables, in the same way that respondents wrote them down in the questionnaire.

 

Resp.1

Resp.2

Resp.3

Case 1

COKE

PEPSI

JOLT

Case 2

SPRITE

SNAPPLE

DR PEPPER

Case 3

PERRIER

GATORADE

MOUNTAIN DEW

For more information, see Multiple Response Tables. See also , Association Rules.